Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole

Details Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole

2009-07-27

arxiv.org/abs/0907.4634v1

Solid State Communications 149 1458 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

24 pages 10 figs

Scientific paper

A hole spin is a potential solid-state q-bit, that may be more robust against nuclear spin induced dephasing than an electron spin. Here we propose and demonstrate the sequential preparation, control and detection of a single hole spin trapped on a self-assembled InGaAs/GaAs quantum dot. The dot is embedded in a photodiode structure under an applied electric-field. Fast, triggered, initialization of a hole spin is achieved by creating a spin-polarized electron-hole pair with a picosecond laser pulse, and in an applied electric-field, waiting for the electron to tunnel leaving a spin-polarized hole. Detection of the hole spin with picosecond time resolution is achieved a second picosecond laser pulse to probe the positive trion transition, where a trion is created conditional on the hole spin to be detected as a change in photocurrent. Finally, using this setup we observe a Rabi rotation of the hole-trion transition that is conditional on the hole spin, which for a pulse-area of $2\pi$ can be used to impart a phase-shift of $\pi$ between the hole spin states, a non-general manipulation of the hole spin.

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